Zvonko Kusić (pronounced [ˌzʋǒːŋko ˈkǔːsit͜ɕ]) (born 14 June 1946) is a Croatian physician who is professor of oncology and nuclear medicine and head of the Department of Oncology and Nuclear Medicine of the Sisters of Charity University Hospital in Zagreb.

Since 1990 he has been the head of the Department of Oncology and Nuclear Medicine of the Sisters of Mercy University Hospital in Zagreb.

In this area, he has successfully cooperated with some of the world's most prestigious medical centers, organizations and leading experts, such as William Henry Beierwaltes, David Becker, Eugen Saenger and others.

He was the principal researcher in a series of Croatian and a number of major international scientific projects.

[1] Zvonko Kusić, FCA, is member of a series of professional and scientific Croatian and international associations and the representative of Croatia at the International Council for the Control of Iodine Deficiency Disorders; he is further editor-in-chief of the Bulletin of the Croatian Thyroid Society, associate editor-in-chief of the Libri Oncologici journal, and member of the editorial board of The Thyroid Gland – Clinical and Experimental.